<html>
  <style>
    body {
      color: red;
      background: url('my file.png');
      border: 1px solid red;
    }
    a + b, a + c, #my_style, #my-style {
      color: blue;
    }
    .a .b {
      color: green;
    }
    a #b, c#d, e.f {
      color: #ff0;
    }
    a:hover {
      content: 'hello, world!; '
    }
  </style>
  <body>
    <h1>Hello, world!</h1>
  </body>
</html>